This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 3 |
| 4 | 5 |
| 5 | 7 |
| 6 | 9 |
| 7 | 33 |
| 8 | 99 |
| 9 | 313 |
| 10 | 585 |
| 11 | 717 |
| 12 | 7447 |
| 13 | 9009 |
| 14 | 15351 |
| 15 | 32223 |
| 16 | 39993 |
| 17 | 53235 |
| 18 | 53835 |
| 19 | 73737 |
| 20 | 585585 |
| 21 | 1758571 |
| 22 | 1934391 |
| 23 | 1979791 |
| 24 | 3129213 |
| 25 | 5071705 |
| 26 | 5259525 |
| 27 | 5841485 |
| 28 | 13500531 |
| 29 | 719848917 |
| 30 | 910373019 |
| 31 | 939474939 |
| 32 | 1290880921 |
| 33 | 7451111547 |